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Hi. They are expressing that the brake needs to be in the released position. If the brake is in the locked position. You will not be able to remove the side cover. The brake would be locked up against the clutch. The handle only has two positions, Locked and unlocked. Please verify that the brake is functioning (locking and unlocking). Write back if there are any questions.
There should be some bolts that allow you to tighten the bar, and a slot that allows the bar to slide when you loosen the bolts. Also, there should be some kind of adjusting screw that allows you to tighten the chain. To remove the old chain and install the new chain, you'll need to completely back off any tension on the adjuster, allowing the bar to move TOWARD the chain saw. You should keep the chain oiled, and whenever it stretches, even a little, you should adjust the chain according to the owners manual too keep it at the right tension. The two mounting slots are usually aligned with something that will keep the chain bar straight; such as a bolt or perhaps a pin in the motor assembly.
Make sure the chain oil is reaching the chain. Can you turn the chain by hand fairly easily? If not, then the chain tension should be adjusted--loosen the drive cover fasteners enough to allow the bar to move up and down somewhat. Turn the chain adjuster screw CCW so that the chain can be moved by hand, but the chain should not droop from the lower bar edge. Re-tighten the cover fasteners and recheck the chain tension. If ok, try to run the saw again--it should run at full speed, 4-stroking lightly, but immediately 2-stroking when cutting. Make sure the fuel mix is fresh using a modern synthetic saw oil and shaking the container thoroughly each time just before filling the tank to prevent oil starvation. Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Hope that some of this helps!
Upside down is not a usual sawing position--only upright, or turned to the left or right side is recommended. If you need to undercut something, keep the saw upright and cut with top side of the chain/bar.This can lead to kick-back if the tip comes free of the log/branch, so you need to control the saw carefully. That's also why there is a chain brake on all newer saws. The leaking may be occurring where the fuel lines pass through the wall of the fuel tank. Hope this helps!
The standard chain file should fit it. It is about 3/16 dia. I found the dremel to work 10 times better, they have a little stone bit just for chains. Eventually, you have to take it in for sharpening, it will set all the teeth the same.
I have the same model chainsaw with the same fault. The brake is not releasing when the brake handle is pulled right back. I can only run mine if the brake handle is pulled back to the main handle with a tyrap - defeats the object of the auto-brake completely. Design fault I reckon.